MC23, I agree with everything you said, except that I think the "+1 attack per unit in range" should be kept if possible, if only because it's very "fluffy".
How about FF6+ for Monoliths? Statistically, if you managed to have 30 units in range (which is, even against horde armies, not that easy to do), that would mean 5 hits.
FF5+ and "extra attacks (+4)", as you suggested, would mean 1,6 hits not matter the number of units in range. So it would be keep the same efficiency not matter what the size of the formation. Easier to balance, but certainly less "fluffy".
FF5+ (+1/unit) 30 units in range > 10 hits 20 units in range > 6,6 hits 10 units in range > 3,3 hits
FF6+ (+1/unit) 30 units in range > 5 hits 20 units in range > 3,3 hits 10 units in range > 1,6 hits
FF5+ (+4 attacks) 30 units in range > 1,6 hits 20 units in range > 1,6 hits 10 units in range > 1,6 hits
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